Questions and answers for exam Preparation

MCQs

Total Questions : 227 | Page 2 of 23 pages

Question 11. How many types of flow are there in a semiconductor?

1
None of these
3
2

Discuss Question

Answer: Option A. -> 1

Question 12. Which one of the following statements best applies to a parallel RLC circuit?

The current waveform for each component always has the same amplitude and phase as the applied current
The sum of the current is always less than the applied current
The voltage waveform for each component always has the same amplitude and phase as the applied voltage
None of these
All of these

Discuss Question

Answer: Option C. -> The voltage waveform for each component always has the same amplitude and phase as the applied voltage

Question 13. Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

Wattmeter
Ammeter
Ohmmeter
Voltmeter
None of these

Discuss Question

Answer: Option C. -> Ohmmeter

Question 14. What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

Solar energy
None of these
Mechanical energy
Chemical energy
Electronical energy

Discuss Question

Answer: Option D. -> Chemical energy

Question 15. The equivalent of 1 micro A is:

1000 A
one-millionth of an ampere
None of these
one million amperes
10000A

Discuss Question

Answer: Option B. -> one-millionth of an ampere

Question 16. Which one of the following statements best describes magnetic hysteresis?

Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
Hysteresis is most apparent when the core material is saturated
None of these

Discuss Question

Answer: Option C. -> Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently

Question 17. Which one of the following phrases most accurately describes a purely inductive circuit?

Resistances provide the only opposition to current flow
Inductive reactance provides the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow
The ac voltage lags the current by 90 degree
None of these

Discuss Question

Answer: Option B. -> Inductive reactance provides the only opposition to current flow

Question 18. Which one of the following phrases best describes residual magnetism?

The amount of magnetic flux that is not confined to the core material of an electromagnet
None of these
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The circular magnetic field that surrounds a conductor carrying a current
The force of attraction between the poles of a permanent and temporary magnetic field

Discuss Question

Answer: Option C. -> Magnetism that remains in the core of an electromagnet after the current through the coil is turned off

Question 19. Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?

P = IE
None of these
I = P/E
P = E2/R
P = I2R

Discuss Question

Answer: Option C. -> I = P/E

Question 20. A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?